Originally Posted by John_V

My Colnago has a round seat post so when I got my Varia, I used the mount that came with it. I also have a saddlebag that takes up pretty much the entire height of the seat post. To mount mine, I had to lift my saddlebag high enough to get the radar underneath it. The problem I was having was that on bumpy roads, the saddlebag would bounce on the radar causing it to turn to the left or right of center. If the radar turned to the right, I would lose any contact with approaching cars. So my DIY solution was an old gas valve key I had lying around. The smaller O-ring that came with the Varia is used to secure the mount to saddlebag. I can easily move the Varia from bike to bike without having to have multiple mounts or remove an existing mount.